which of the following atoms wil has smallest size 1 Mg 2 Na 3 Be 4 Li. Explain answer with correct explanation. No link

Dear Student,

The atomic size of elements increases down the group due to increase in number of shells as we go down the group.
Also, the atomic size of elements decreases on moving left to right in a period, due to the increase in nuclear charge (as electrons are added to the same shell, these electrons gets attracted towards the nucleus, thus decreasing the atomic size.
So, Be (Beryllium) will have the smallest size. As it contains only 2 shells/orbits and its nuclear charge is greater than Li (Lithium).

Hope this clears your doubts about the topic

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